Connected: An Internet Encyclopedia
RFC 821 - 3. THE SMTP PROCEDURES

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### 3. THE SMTP PROCEDURES

This section presents the procedures used in SMTP in several parts. First comes the basic mail procedure defined as a mail transaction. Following this are descriptions of forwarding mail, verifying mailbox names and expanding mailing lists, sending to terminals instead of or in combination with mailboxes, and the opening and closing exchanges. At the end of this section are comments on relaying, a note on mail domains, and a discussion of changing roles. Throughout this section are examples of partial command and reply sequences, several complete scenarios are presented in Appendix F.

3.1. MAIL
3.2. FORWARDING
3.3. VERIFYING AND EXPANDING
3.4. SENDING AND MAILING
3.5. OPENING AND CLOSING
3.6. RELAYING
3.7. DOMAINS
3.8. CHANGING ROLES

Next: 3.1. MAIL

Connected: An Internet Encyclopedia
RFC 821 - 3. THE SMTP PROCEDURES